170_OR_850_Hz_SHlFT

Published:2009/7/15 2:01:00 Author:Jessie | From:SeekIC

Simple AF RTTY keyer uses 2N5823 silicon PNP transistor switch instead of optical coupler. Short piece of coax serves as 1-turn output link. Outer shield is grounded only at coaxial connector so braid acts as Faraday shield, eliminating capacitive signal and noise pickup from circuit.-E. Noll, Circuits and Techniques, Ham Radio, April 1976, p 40-43.



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